LISA MILLAR: The police are confirming that we are dealing with the suspects in the Boston bombing here Tim and that one of those suspects is dead. He was killed in that gunfight with police earlier.

Just a recap - there was a gunfight there were explosions heard. This occurred after a police officer was shot dead earlier this evening. Ed Davis, the police commissioner, is saying that he believes they're dealing with a terrorist on the loose in Boston tonight.

We believe this is a man who's come here to kill people is what he's told reporters in a briefing. There is a massive manhunt underway in this area, helicopters overhead and an incredible number of police combing the streets going house to house at the moment trying to find this second suspect in the Boston bombing.

TIM PALMER: Lisa can you clarify, there were suggestions the dead man was identified as the one shown wearing a black cap in that FBI press conference earlier is that right?

LISA MILLAR: That hasn't been clarified by police Tim. I know that there are reports identifying one or the other but that hasn't been clarified by police. At the moment they are saying that one of the suspects is dead the other one is on the loose. There were, residents were saying there were at least 80 gunshots that they heard and explosions when the suspects encountered police here in this suburb.

TIM PALMER: One report on the wires suggest the gunmen both in a car were throwing explosives out of the car at police as they were being pursued. Have you heard that put forward as an explanation of those explosions being heard?

LISA MILLAR: No I haven't but there are, media are scattered out around this area in different spots and various people are reporting different bits of information. The police briefing wasn't lengthy. It was just to confirm those facts that I've told you now.

TIM PALMER: Lisa, so one policeman already killed and now one of the suspects killed in this. How much of the city is essentially shutdown while they chase this other remaining suspect?

LISA MILLAR: We're out away from the centre of Boston city but we're talking about a 20 block radius of this suburb of Watertown. It's about a 15 minute drive from where the bombs went off the other day at the end of the marathon finish line.

It's, you know, target shopping malls, homes, some small light industrial areas. It's definitely a very suburban feel. When we drove in we were seeing the police officers going house to house with the flashlights not realising that we had entered that area that had already been cordoned off and blocked by police.

So we are now in an area where all the media have been pushed into and they're keeping us right back from what's going on warning that this is an incredibly dangerous situation.

TIM PALMER: Our correspondent in North America correspondent Lisa Millar there in Watertown district of Boston and just to repeat that after a gun battle at the Massachusetts Institute of Technology where one policeman was killed, a carjacking took place and one of the suspects in the Boston Marathon has been confirmed killed by police, the other suspect believed on the loose in this massive manhunt in that area.

SECOND UPDATE: Just to recap the events in Boston in the last few minutes. One of the suspects in the Boston Marathon bombings has been confirmed as to have been killed by police during a police pursuit. The other suspect, who is the man wearing a white cap in images released by the FBI five hours ago, is on the loose still. The Boston police commissioner has described this man as to be, "a terrorist who has come here to kill people". He's been described as armed and dangerous.